dt-bindings: Add optional EUD parameter for interrupt mask

The EUD driver defaults to using INT1 as the interrupt mask
for the apps processor. However, on modem, this interrupt
does not serve the apps processor, so add a new optional
device tree binding which can specify the offset of the
interrupt mask used for the apps processor and override the
default.

Change-Id: Id73336dcf737945effc254d3179bbfe354a5026b

bindings/soc/qcom/qcom,msm-eud.yaml

@@ -40,6 +40,11 @@ properties:
     Value type: <string>
     Definition: Must be "eud_irq"
 
+  interrupt-mask:
+    Usage: optional
+    Value type: <prop-encoded-array>
+    Definition: offset of the interrupt mask for apps if not INT1
+
   reg-names:
     Usage: optional
     Value type: <string>